APC_100_GI_part_4 - a Fish Fish have a hepatopancreas...

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a. Fish : Fish have a hepatopancreas , basically a liver with pancreatic tissue embedded in it. The pancreatic tissue surrounds the larger branches of the portal vein. However, pancreatic tissue is not limited to the liver. Pancreatic tissue is spread throughout the mesentery of fish and sometimes extends into the spleen. Sharks have endocrine tissue in layers of one or two cells that surrounds the exocrine pancreas. Boney fish often have distinct islets, but these are relatively few in number. Peritoneum The peritoneum covers all the contents of the abdominal cavity. The peritoneum and the serosa are synonymous. The peritoneum covers the exterior of all of the abdominal organs including the gut. It consists of a layer of epithelial cells (mesodermal origin) and some associated connective tissue. Peritoneum has two primary functions. First, it forms mesenteries that help to support and anchor the gut and other organs in place. They basically function as ligaments, but they also serve as conduits for vasculature, lymphatic, and nerves. Second its surface is slick, which helps
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